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Byju's Answer
Standard XII
Mathematics
Definition of Hyperbola
Find the orth...
Question
Find the orthogonal trajectories of the following familiy of curves
y
=
C
e
−
2
x
A
y
2
=
x
+
K
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B
y
2
=
−
x
+
K
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C
y
2
=
x
2
+
K
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D
y
2
+
x
2
=
K
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Solution
The correct option is
A
y
2
=
x
+
K
y
=
c
e
−
2
x
⇒
y
e
2
x
=
c
⇒
y
′
e
2
x
+
2
y
e
2
x
=
0
⇒
y
′
=
−
2
y
Replacing
d
y
d
x
by
−
d
x
d
y
, we get
y
′
=
1
2
y
⇒
2
y
d
y
=
x
d
x
⇒
y
2
=
x
+
K
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The
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y
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ax
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.